Rotation induction device for vehicle

Abstract

A rotation induction device for a vehicle includes: an upper case having a piston rod disposed therethrough; a lower case disposed adjacent to the upper case and having the piston rod disposed therethrough; a center plate disposed between the upper case and the lower case such that the piston rod passes through the center plate, to induce rotation of one or both of the upper case and the lower case; and a position guide part formed on one or both of the upper case and the lower case, to guide a position of the center plate.

What is claimed is: 
     
       1. A rotation induction device for a vehicle, comprising:
 an upper case having a piston rod disposed therethrough; 
 a lower case disposed adjacent to the upper case and having the piston rod disposed therethrough; 
 a center plate disposed between the upper case and the lower case such that the piston rod passes through the center plate, and configured to induce rotation of one or both of the upper case and the lower case; and 
 a position guide part formed on one or both of the upper case and the lower case, and configured to guide a position of the center plate; and 
 a friction restraint part comprising an upper restraint part formed on either the upper case or an upper surface of the center plate and including upper curved surfaces that bring the upper case into contact with the center plate and a lower restraint part formed on either the lower case or a lower surface of the center plate and including lower curved surfaces that bring the lower case into contact with the center plate, wherein 
 the upper case comprises an upper blocking part disposed at a periphery thereof to block an inflow of foreign matters, the upper blocking part comprises an upper blocking hook part extended toward the lower case, and the upper blocking hook part comprises an upper inclined surface formed thereon, the upper inclined surface extending downward and away from the center plate, and 
 the lower case comprises a lower blocking part disposed at a periphery thereof to block an inflow of foreign matters, the lower blocking part comprises a lower blocking dropping part extended toward an end of the upper blocking hook part so as to drop foreign matters, and the lower blocking dropping part comprises a lower inclined surface corresponding to the upper inclined surface, the lower inclined surface extending downward and away from the center plate. 
 
     
     
       2. The rotation induction device of  claim 1 , wherein the upper case comprises:
 an upper cover part configured to cover a first surface of the center plate, the upper cover part defining an upper hole through which the piston rod passes, and 
 the upper blocking part is disposed at a periphery of the upper cover part. 
 
     
     
       3. The rotation induction device of  claim 2 , wherein the lower case comprises:
 a lower cover part configured to cover a second surface of the center plate, the lower cover part defining a lower hole through which the piston rod passes, and 
 the lower blocking part is disposed at a periphery of the lower cover part. 
 
     
     
       4. The rotation induction device of  claim 3 , wherein the upper blocking part comprises:
 an upper blocking protrusion part protruding from the upper cover part toward the lower case, and disposed to face the upper blocking hook part across a space. 
 
     
     
       5. The rotation induction device of  claim 4 , wherein the lower blocking part comprises:
 a lower blocking locking part disposed along the periphery of the lower cover part, and defining a groove into which the upper blocking hook part is configured to be locked and fixed; and 
 a lower blocking protrusion part protruding from the periphery of the lower cover part toward the upper case, and disposed in the space between the upper blocking hook part and the upper blocking protrusion part. 
 
     
     
       6. The rotation induction device of  claim 5 , wherein the upper inclined surface is disposed on an outer end of the upper blocking hook part. 
     
     
       7. The rotation induction device of  claim 5 , wherein the lower blocking protrusion part overlaps with the upper blocking protrusion part. 
     
     
       8. The rotation induction device of  claim 1 , wherein the position guide part comprises:
 an upper guide part protruding from the upper case toward the lower case to support an inner circumferential surface of the center plate; and 
 a lower guide part protruding from the lower case toward the upper case to support an outer circumferential surface of the center plate. 
 
     
     
       9. The rotation induction device of  claim 8 , wherein the upper guide part and the lower guide part each have an annular shape. 
     
     
       10. The rotation induction device of  claim 1 , wherein one or more of the upper case, the lower case, and the center plate are composed of a synthetic resin material. 
     
     
       11. The rotation induction device of  claim 1 , further comprising:
 a first lubricant retention part protruding from the lower case toward the upper case and covering an inner peripheral surface of the center plate to prevent lubricant from overflowing to an inside of the center plate; and 
 a second lubricant retention part protruding from the lower case toward the upper case and covering an outer peripheral surface of the center plate to prevent lubricant from overflowing to the inside of the center plate. 
 
     
     
       12. The rotation induction device of  claim 11 , wherein a height of each of the first lubricant retention part and the second lubricant retention part is in the range of 50% to 60% of a height of the center plate. 
     
     
       13. The rotation induction device of  claim 1 , wherein the upper restraint part is formed on the upper case and the upper curved surfaces extend downward to contact the center plate, the lower restraint part is formed on the lower case and the lower curved surfaces extend upward to contact the center plate. 
     
     
       14. The rotation induction device of  claim 1 , wherein the upper restraint part is formed on the upper surface of the center plate and the upper curved surfaces extend upward to contact the upper case, the lower restraint part is formed on the lower surface of the center plate and the lower curved surfaces extend downward to contact the lower case.